In motion weighing is the technology which is used to measure the weight of a moving vehicle. Weigh In-Motion (WIM) systems are capable of measuring vehicles travelling at a reduced or normal traffic speed and do not require the vehicle to come to a stop

1. Presented By:-
Harish Kumawat
Guided By:-
Prof Preet Jain
Shri Vaishnav Institute of Technology and Science, Indore (M.P.)

2.  In motion weighing is the technology which is used
to measure the weight of a moving vehicle.
 This is the process for measuring the dynamic tire
forces of a moving vehicle and estimating the
corresponding tire loads of the static vehicle.
 Weigh In-Motion (WIM) systems are capable of
measuring vehicles travelling at a reduced or
normal traffic speed and do not require the vehicle
to come to a stop.

3. Dynamic
Weight : 860
Kg
ROAD
SURFACE
LOAD CELL
STRIP

4.  Road wear and safety.
 Collection of reliable data for designing
pavements and Bridges.
 To reduce Bridge damages.
 for management, statistics and economic
surveys of traffic.
 Provide necessary information for the tax
system.

5.  The Damage to Roads and Bridges
 Great Loss in The State’s Regulation Fees and
Tax income
 The Harm to The Traffic Security
 Disorder in The Road Transportation

6.  Low speed systems (<5 km/h)
◦ Provide the high level of accuracy needed for
enforcement or toll collection
 High speed systems (>15 km/h)
◦ Minimize or eliminate vehicle disruption while
permitting data of sufficient accuracy for planning
and screening

7.  Permanent
◦ Sensors and the data acquisition systems collect data
at the same location
 Semi-permanent
◦ Sensors are built into pavement while the data
collection system is moved from site to site
 Portable
◦ Sensors and equipment are moved from site to site

8.  Permanent or temporary installation into or
onto the road surface
 Can be installed directly into the road in a
flexible format
 Can confirm to the profile of the road
 Flat construction, small cut

9.  Accurate weighing device - Weighpads or
Axlepads
 Very high speed A/D converter to change the
voltage signal into required data
 Software package for data collection and
analysis

12.  Remove the load from the load cell.
 For Zero weight, there is some ADC output.
 Now keep some known weight, like 10 Kg on
the load cell.
 There is some another reading of ADC for that
weight.
 Eg:- Weight (Kg.) ADC Output
0 100
10 200

13. 0
200
400
600
0 100 200 300
Weight curve
ADC
output
Weight (kg) 
ADCOutput

14.  Slow speed WIM System.
 Measure the overall weight of a vehicle.
 Monitor the speed of a vehicle.
 Monitor the number of vehicles passing by.
 Sends the data to the system which is logged
using Data Logging Software.
 Operational Speed limit < 5km/h.

15. Mechanical
Structure
Load Cell
Processing
Unit
(LPC2129-
ARM7)
Amplifier
and ADC
IR Sensor
User
Communication
Unit

16. IR Sensor
Vehicle
Display Unit
Load Cell
Strip
Road Structure

17. 0
100
200
300
400
500
600
700
800
900
1000
0 1 2 3 4 5 6 7
Weight without
Formulation
Weight after
Processing of Data
Speed (Km/hr) 
Weight(gms)

Static Weight = 936 gm

18.  Management of freight traffic
 Design and maintenance of road
infrastructure
 Monitoring of vehicle and axle loads
 Mainline Screening
 Ramp Screening
 High speed data collection
 Automated toll section

19.  The system is successfully running at a speed
of 5 km/hr.
 Various traffic data is been collected in the
system like number of vehicle, number of axles
and speed measurement.
 The prototype comprises of limited and most
easily available resources, hence in future one
can work upon enhancing the In motion
measurement at higher speed.

20. 1) National Audit Office, 1987, "Department of Transport: Regulation
of heavy lorries", HMSO, London, England.
2) S. Fujimoto, T. Ono, Z. G Wang, KOhsaka: Evalualion of an In-Motion
Vehicle Weighing Method via Grey Estimation Model, Pmc. of SICE
Annual Conference 2002, Papa No. SICE02-0500 (2002)
3) Sarah K. Leming, Harold L. Stalford, “Bridge Weighin-Motion System
Development Using Superposition of Dynamic Truck/ Static Bridge
Interaction”, Proceedings of the American Control Conference, Denver,
Colorado June 4-6, 2003.
4) K. Fukuda, K. Kameoka, T. Ono and K. Yoshida, “Evaluation of a New
Mass-estimation Method for Axle Weights of In-motion Vehicles Using
Vehicle Models”, Proceedings of the 17th IMEKO TC3 International
Conference, Istanbul/Turkey, 2001, pp. 219-229
5) Andrew J. Pratt, Rob Bushman, “Weigh In Motion Technology -
Economics and Performance”, Presented at NATMEC ’98, Charlotte,
North Carolina.
6) K. Fukuda, K. Yoshida, T. Ono, K. Kameoka, T.Hirata, “An advanced
algorithm for estimating axle weights of in-motion vehicles”.
7) http://www.irc.org.in/ENU/knowledge/Editorial/January%202004

21. 8) Fundamentals of Embedded Software - Where C and Assembly Meet,
2002, Daniel W. Lewis
9) Truck instrumentation for dynamic load measurement by Emmanuel
Fernando, Gerry Harrison and Stacy Hilbrich, Performed in cooperation
with the Texas Department of Transportation and the Federal
Highway Administration, Published: December 2007.
10) An Overview of Research on Weigh-in-motion System, Jinfang Wang
and Mingguang Wu, Institute of Industrial Process Control, Zhejiang
University HangZhou, Proceedings of the 5Ih World Congress on
Intelligent Control and Automation, June 15-19, 2004, Hangzhou, P.R.
China.
11) Zuoshi Cui, Yuguo Wang, Zuoji Ma and Xiaosong Wang, “Simply
analysis on the overweight vehicles’ damage on the road.”
12) http://www.keil.com/dd/docs/datashts/philips/lpc2119_2129.pdf
13) http://www.ni.com/white-paper/2946/en/
14) https://www.freebsd.org/doc/en/articles/serial-uart/
15) http://www.loadstarsensors.com/what-is-a-load-cell.html